Heavy showers and thunderstorms produced flash flooding along many major roads, which resulted in road closures. The most significant flooding occurred along the Deegan and Cross Bronx Expressways, about 2 miles west of East Tremont in the Bronx; along Northern Blvd. of Jackson Heights in Queens; and along the railroad train tracks, Wantagh Ave. and North Jerusalem Road in Wantagh, where up to 3 feet of water submerged cars. Significant flooding, which resulted in road closures, also occurred in Yaphank. Up to 2.20 inches of rain was measured in Lake Grove.

A severe thunderstorm produced a weak F0 tornado as it moved across extreme southeast Nassau County and extreme southwest Suffolk County between 12 Noon and 12:15 pm EDT. This was confirmed by a NWS Storm Survey team. The tornado's path length was only about one quarter mile long and its' maximum path width was around 150 yards. There was significant tree damage along its' path. Rotation was evident in the tops of many trees. The most damage occurred in East Massapequa between Merrick Road and Route 27A, Old Sunrise Highway. It was concentrated around Clocks Blvd. southeast across Melrose Ave. and County Line Road, then across Amityville's Old Fields and Homestead Avenues. The tornado lifted into the parent cloud before reaching South Ketcham Avenue.

This severe thunderstorm produced damaging winds, large hail, and torrential rain along its' path. Large tree branches were downed in Wantagh. Quarter size hail was reported in Farmingdale. Flash flooding also occurred along its' path.